Machine for reducing ore.



v' R. P. PARK.

MACHINE ron enucms ORE'.

APPLICATION FILED MAY 25, 1918.

R. P. PARK.

MACHINE FOR REDUCING ORE. APPLlcMloN min MAY 2s. me.

1,281,646. Patented 00u15, 1918.

2 SHEETS-SHEET 2.

STATES RICHARD r. PARK, 0F MELBOURNE, VICTORIA, AUSTRALIA.

' MACHINE FOR REDUCING ORE.

Specification of Letters Patent.

Patented Oct. 15,1918.

following is a specification.

This invention relates to machines for reducing ore, the primary object bein to provide means whereby a maximum of ore may be pulverized to` anyrdesired degree in a minimum of time.

The invention is adapted for the reduction of many and various kinds of ore and has been found particularly advantageous in the treatment ofv mica bearing material which has hitherto been regarded as one of the most diicult of ores to treat.

'According to the invention the ore is fed on to a revolving ring or table which carries it beneath a succession of crushing and grinding rollers which are adapted to gradually reduce the ore to anydesired state of subdivision. This gradual reduction is due tothe arrangement of the, rollers in stepped relationship to the table as will be I hereinafter better understood.

A material feature of the invention is the driving of the crushingand grinding rollers at a vconsiderably higher speed than the speed ofrotation'of the table. This has the effect. of notonly crushing the material by direct compression betweenl the rollers and table but `sets up a shearing or grinding action which reduces 4'the ore in a highly y edective manner.

A further feature of the invention resides inthe provision of means for adjusting the rollers to or from the table whereby the degree of neness of the resultant product may be regulated to any desired degree. By this means the objectionable slumming whichfrequently occurs during r4the subsequent otation treatment of the reduced material is obviated. This fslumming or floating away of the material on the surface :of the liquid used in separation is due to the reduction of the ore to too line a degree and with most .types of ore mill cannot be prevented.

This invention also provides for regulating the pressurev on the crushing and'grinding rollers and for allowing them torise and pass any foreign obstruction such as a hammer head, which might be lpassed into the machine with the ore.

Referring to the drawings which form a I part of this specification :-k I

Figure 1 is a sectional view of the invention taken approximately onV the line A-A of Fig. 2. Parts are broken'away and removed forconvenience ofillustration.

Fig. 2 is a plan of Fig. 1 portion being broken away to reveal a complete set of crushing and grinding rollers and portion of a oating ring by which the said rollers are driven.

Fig. 3 is a side elevation partly in section looking at the right hand side of Fig. 2.

Fig. 4 is a diagram showing the stepped relationship of the rollers to the table whereby the material is gradually reduced step by step from `the first roller on the right to the last roller on the left.

Fig. 5 is a detail view on an enlarged scale showing portion of the floating ring.

Fig.A 6 is a detail view onV an enlarged scale showing portion of the revolving table which engages with and drives the floating ring.

Fig. 7 is an endview on an enlarged scale of a boss and the second and third guide rollers which form a track lfor the floating ring.

Fig. 8 is a plan view of portion of a race showing the yfirst guide rollers which supportY the revolving table.

On reference to the drawings it will be seen'that 2 indicates thefoundai ion plate or base upon which rest standards 3. Mountedv upon 'the said standards is a stationary race 4 having at Aits bottom a wea-ring ring 6. Disposed within said race are a pairof removable hoops 7 which vform bearings for the yspindles of lirst guide rollers 8.

Mounted in suitable bearings 9 and 11 arel main driving shaftsy V12 carrying main Engaging the mainv driving. pinions 13 is .a

toothed ring'lc. This is'fixed to the bottom terial suitable to form a grinding surface for the table. Attached to the outside of the revolving table is an upstanding ring 21. This is vertically adjustable in relation to the surface of the table by means vo fadjustingscrews 23 and slots 24 and prevents material escaping over the outer' edge of the table.

the surface of the table toprevent the overflow of the slime.

Upstanding from the vinterior of thetable are a pair of inner revolving dust rings26 which'prevent the access ofy dust or other foreign matter tothe toothed gearing hereinafterreferred to which drivesithe crush-k y l rollers may be arranged in one, twoor more..y

ing and grinding rollers. Between thedust rings 26 are a series ofopenings 27 through which lsuch foreign matter may escape.

Protruding from the inner circumference ofV the revolving table vare aV series of vertical keys'28 which engage keyways in the floating ring hereinafter referred to. c

Rotated by the revolving ring or tableis a floating ring 29. This isprovided with a series of vertical keyways 31 (Fig. 5) toy accommodate the keys 28on the table.` `The upper surface of the floating ring is provided with a toothed ring 32. Aroundthe `bottom of the floating ring extends a lip 33 insidewhich is a runway 35 for a series of second guide rollers hereinafter mentioned.v

Upstanding fromthefoundation plate are a series of guides 34. Between these guides is situated the lower end of a stationary ballast'holder 36 which is preventedfromrotating by said guides. At each corneroffthe bottom of the ballast holder is a lugf37. Through this extends a vertical threaded hole to accommodate an adjusting screw 38. These adjusting screws are providedl with rounded heads which rest upon the foundation plate. in desired positions by lock nuts 41. Passing through the bottomof the ballast holder is a central hole ythrough which passes a vertical tension bolt'43 which at jits lower end is universally connected to the foundation plate by means ofa balland socketl or other joint 44.

Surrounding the lower end of the tension bolt is a Asleeve or distance piece 47 above which is a loading spring 48. Upon lthe loading spring rests ay washer 49 above whichare adjusting nuts 51.which engage vthe threaded upper end 5 2.l of the tension In wet crushing operations this ring' can be raised'to a considerable height 'above The said screws may be lockedA Protruding from the side of the ballast holder are a series of studs 53 upon the outer ends of which are mounted second Yguide rollers 54 uponwhich .rests the oating ring 29. Surrounding andvk iXedt'o eachstu'd 53 is a boss 56 which carries a pin 57. Around these pins rotate thirdzguide rollers '58 which bear against the inner surface of the floatiingy ring as seeny in Fig. 1.

Surrounding the top of the ballast holder is a flange 59 upon which rests afstationarydepending hood 61. Formed on the said hood is an inner stationary dust ring 65 and a Series of inclined bearings62, these accommoq date thelinner ends of inclinedshafts?) the outer `ends of which kare` supported "outer bearings 64at the lower ends of brackets.-

The braclrets66 are attached teamenf,v

larged mouth or hopper 67 which converges downwardly tothe top ofthe ballastlhelder..

Mounted upon each of the inclined .shafts 53'is a crushing and grinding roller. yT hese`-,V

sets or series, each series providing. an ingependent ore reducing mechanism. In. ther drawingsv two series of VVthree vcrushing 'and grinding rollersare shown each 4serieslconi-- prising a first 'or smallest roller 68,'a seoond or larger roller` 69, and a third orlarg-l -est roller 71, but l do not limit fmyself'to any particular number ofv rollersnwxhieh of the rollers are'l disposed upon a lsin-gle horizontal line but owing to their varying diameters the space which exists' between j the periphery of each roller and the surface of the revolving table gradually diminishesv from the ylirst roller 68gtothelast roller7l',

by thisteprd formation thfeQreagrafu-s ally reduced to therequired degree offffineness which Vis represented bythe distancebe-Y tween the periphery of `theflast`vv rollerjl and the surfa'ceof thetable. Y

Each crushing and l gri-ndingfrollei vtapers toward the centerof the table and:,'is1 p"r.o; V vided with a removable'shoe-81 offmaterial.

suitable Vto form a Ycrushing surface. yThe shoes are provided withinturnedflanges82' which are screwed orf otherwise y secured .O the body Vof the"rollen:v TheCrushing:y and' grinding' rollers are stationary as regards their disposition' over the table"' butfare y.V

driven by means of bevel pinions 83.enga'gf ing the teeth I32 uponV the floating, ring, A, the

ratio between the toothed ring 32 an'd .fthej pinions 83 being such that.thefrollersjarel driven at a considerablyjhigher speed,than' the speed of rotation of the table.

The ore is fed onto 'th"re`vol ving throu feeding ,chutesf84 dispo ,sedfifnf front; 'y

' of each of thefirst rollers '68ofeach'v series@V In some cases itmay bel desirabletoprovide the *periphery lof i diese -lira A fellas.. iaith: a!

seriesof axial grooves to better pick up the larger pieces of ore falling through the chutes on to the table.

Situated behind each of the nal rollers 71 is a discharge chute 86 into which the pulverized material is diverted by means of diagonal stop plates 87. These stop plates are held tightly down upon the surface of the table. by springs 88 the rear end of the stop plates being pivoted at 85 to the bottom of the feed chutes or other stationary part of the machine.

Disposed behind each of the crushing and grinding rollers is a scraper 89 which removes any of the crushed material which might remain clinging to the surface of the roller.

The scraper of the final roller of each series is in the form of a combined scraper and guard 91 seen clearly in Fig. 3. This besides scraping the material from the roller prevents dust or slime being thrown up at the discharging point.

Attached to extensions yfrom the outer bearings 64 is an outer stationary dust ring 92 which partially surrounds the tabe being cut away as shown in Fig. 2 to allow the pulverized material to pass o the tab-le into the discharge chutes. Y

In operation the main driving pinions drive the toothed ring 14 and with itthe revolving ring or table vwhich runs freely upon the first guide rollers 8. By reason of the keys 28 the floating ring is also rotated running `freely upon the second and third guide rollers. rotates, its toothed ring 32 drives the bevel pinions 83 which in turn drive the shaftsV 63 and the crushing and grinding rollers. It will thus be seen that while the floating ring and the crushing and guiding rollers are driven by the table they are capable of independent vertical movement in relation thereto.

As the ore is fed through the feed chutes 84 it falls upon the table in front of the first crushing and grinding rollers 68 beneath which it is carried and partially reduced. It is then carried forward by the table andsuccessively further reduced by the intermediate and final crushing and grinding rollers from which latter it emerges in the required state of subdivision. After the reduced material has passed the final rollers it is carried forward by the table until it encounters the'diagonalwstop plates 87 against which it banks up and is diverted over the ring 21 into the discharge chutes.

It will be seen adjusting screws 38 the oating ring'and 'the crushing and grinding rollers may be 'raisedV or lowered bodilyjn relation' tothe table. By this means wear between the rollersfand the table may be taken up and furthermore As the floating ring` the rollers may beso adjusted as to reduce the material to any desired degreet This adjustment may be effected by raisingfthe rollers as aforesaid bythe operation of the adjusting screws and then placing a gage between the largest or final rollers and the table this gage corresponding to the sizeof the pulverized material which it is desired to produce. The rollers may then belowered by reverse movement of the adjusting screws until they rest or almost rest upon the gage which is then removed. The lock nuts 41 are then tightened and the final rollers 71 are set at a distance above thel table equal to the size of the resultant material while the first and intermediate rollers are set at a proportionate distance higher.

By the foregoing means the material may be reduced to the finest of powders by lowering the rollers suiiiciently close to the table or as is frequently desired with certain ores such as tin, wolfram or molybdenite the machine may be adjusted to produce a coarser product which will not be subjected to the objectionable slumming7 before mentioned.

It will further be seen that should an obstruction be conveyed into the machine with Y the ore it will on encountering the crushing and grinding rollers cause them to rise thereby allowing the obstruction vto pass without-injuring the mechanism. The universal connection 44 permits the ballast holder and other parts to cant slightly should the machine rise more on one side than the other. The loading spring 48 will exert sufficient pressure on the crushing and grinding rollers to fulfil most requirements and this pressure may be regulated by adjusting the nuts 51 on the tension bolt. Should it be desired, however to load'the rollers beyond the strength of the spring any suitable ballast material may be intro' duced into the ballast holder through its enlarged mouth 67.

The invention provides a highly eiiicientv mill which as above stated may be regulated to reduce ores to various degrees ofsubdi# vision and' allows of obstructions passing without injuring the parts. The arrangement by which the crushing andA grinding rollers are rotated in the same direction but Ato perform. lt will be obvious that other y L means may be adopted to obtain this latter that by manipulation y.of the diameters but mounted at different heights result such as'the use of rollers of equal' to transport purposes which is of particular dismantled and thus' lends itself particularly-' advantage considering the inaccessible local ities V.in r,Which such fmachines are frequently needed.v

la-.ving'novvl described myinvention what I claima'snevvand vdesire to-secure by Let ters` Patent is 1.1I'namachi-iiefor reducing ore, a re volvingringyzor table, a floating ring driven by saidtable and. capable of moving verticallyi .and V.independently of `said table,

crushing; Yand .1 grinding rollers coperating t 3. In a'maehinefor.v reducing ore, a re volvi-ng :ri ng ork table, crushing .and grinding rollers. coperating.l Witlii'said table, means whereby said rollersare-driven v at a .higher peripheral. speedthamthe speed of rotationof thertable, a ballast holderv supporting the ,crushing and grinding rollers, a loading springlocatedWithin said ballast holder.A and pressing-upon saidfrollers, `and a centraltensionzbolt passing-through the.Y loading, ,spring anduniversally connected at its-lower endtozthe foundation of themachine;

4,111 ainachine for reducing ore, a revolving.; `ring,or-.table, Ya floating ring. driven by-said tableifandgcapable of independentvertical movement-inrelation. thereto, aV series .ofi crnshing..and.. grinding rollers. ar-

ranged near and above the surface of said table, meansfQreXertingipressure.upon said rollers,-;meansl.for adjustingy said pressurev and means for vertically adjusting the lioating-.ring andzthe rollers yinrelation tothe table.

5,.,In a machine'ffor. reducingore, a revolving ring lor-table,. aflOating ring driven by` said table. andeapableof independent vvertical movement in relationthereto, a'centrally situated-ballastholder, guide rollers carried by-said ballast holderfand adapted to .support-said floating ring,l a series of* crushing and-.grinding rollers arranged near.r

and above the .surface of the table and driven l by said .lioatingfringl a tension boltV located at. the-center offsaidballast.holder and universallyA connected at itsrlower. end

toV the .foundation :of .the machine, an Vadjusting loading .spring surrounding said bol-tandvadjusting screws adapted lto vraise nes-1,646.2

ing and grinding rollers.

6. In a machinefor reducing yore, a re# and lower the'ballast-'holder yand the volvingring or' table, keys 'carried bysaid y table, a floating ring liavingglieyways to accommodate said keys,r a toothed' ringvcarried by said ioating ring, la-ballast holder,

guide]rollerscarried by the ballast]holder and supporting thelioatingring, adjustable loading means adapted to press-'Ky upon the ballast holder, means forverticallyadjusting the ballast` holder, a hood. depending from 'the :top of .the ballastV holder, anenlarged mouthy or hopper abovey said-hood,v inclined shafts supported kby said hood, a

pinioncarriedbyeach of saidvshaftsfa'nd engaging sald toothed ring and a crushing and grindingroller carried by each said shaft, said crushing and grinding rollers being arranged near and above thesurface ofthe table-for the purpose setforth.

7. In a. machinefor reducingore, arevolving ring or table, keys'carriedfby vsaid.

table, a floating ring havinglkeyways .to

Y accommodate said keys, atoothedring car ried by said floating. ring, .a centrallylocated ballast holder, a tension bolt vpassing through saidiballast holder and Auniversallyconnected to the foundation of themachine,

guide rollers carried by the ballast holder and supporting the floating ring, `an yadjustable f loading spring surrounding the tension bolt and :adapted'to press Aupon the ing the .ballast holder, a hood depending fromfthe top'ofthe ballastholder, an en larged mouth or hopper above said hood, inclined s haftssupportedl by said hoodj-a pinion carriedby each ofsaidshafts and engaging said toothed ring,:a crushingand grinding yroller carried by each ksaid shaft, and dust: excluding means surroundingthe pinions and.' toothed ring. i

8. In a machine for reducing ore, Aa ref volving ring or,` table, a seriesof crushing andl grinding rollers arrangedinearl 'and above ythe surfaceof the table, means Where# by said'rollers aredriven in the saine direction as but at a higher peripheral speed than the speed of rotation of the-table, and a vertically adjustable ring attached to the outside ofthe revolving table for the pur-- pose .setpforth f Y 9Lj'j-Inwamachine for reducing ore,.a substantially horizontal revolving table, '-means to drive the table, a ballast holder arranged near thecentral portioiiof the table,zad'Y justable supporting means for the' ballast ballast holder, iiieans for vertically adjustholder whereby it may be moved vertically' l with relationto .the table, means including a yielding.element to normallyI retainpthe ballast holderV against movement 'and i-allo'W- 1 ing 'of restrictedvertical and.' lateral move-w ments, shafts securedl tol the ballast. holder and extending substantially radially above the table, rollers carried by the shafts and coacting with the table7 pinions secured to the shafts to drive them and gearing engaging the pinions to drive them and having vertically adjustable connection with the table to be driven thereby.

l0. In a machine for reducing ore, a substantially horizontal annular revolving table, means to drive the table, a substantially vertical ballast holder arranged Within the annular table, means to vertically adjust the ballast holder With relation to the table, shafts secured to the ballast holder and extending substantially radially above the table, rollers secured to the shafts and c0- acting with the table, pinions secured to the inner portions of the shafts, a ring gear surrounding the ballast holder and disposed between the same and the table and engaging the pinions to drive them, supporting means for the ring gear carried by the ballast holder, and slidable connections between the ring gear and annular table.

In testimony whereof I affix my signature.

R. P. PARK. Witness;

CECIL MCGLASTNER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

